Current Knowledge and Future Directions for Cyclospora cayetanensis Research and Its Surrogates.

Area of Science:

• Foodborne protozoan parasites
• Food safety and public health
• Molecular detection and diagnostics

Background:

• Cyclospora cayetanensis causes cyclosporiasis, a foodborne illness linked to contaminated produce, with recent US outbreaks raising concerns.
• Research is hampered by difficulties in culturing the parasite and limited genomic characterization.
• Existing detection methods face challenges due to low oocyst concentrations and non-standardized sampling.

Purpose of the Study:

• To review current knowledge on Cyclospora cayetanensis, including occurrence, transmission, detection, host-parasite interactions, genetics, and remediation.
• To evaluate the utility of surrogate organisms like Eimeria spp. and Cryptosporidium parvum in addressing research gaps.
• To identify emerging tools and strategies for overcoming research and detection barriers.

Main Methods:

• Literature review of Cyclospora cayetanensis research.
• Analysis of current detection methodologies, including the FDA BAM Chapter 19c method.
• Evaluation of surrogate organism models (Eimeria spp., Cryptosporidium parvum) for research.
• Assessment of genomic advancements and potential of new technologies like metagenomics and AI.

Main Results:

• Detection remains difficult due to low oocyst levels and sampling issues, despite improved methods.
• Surrogate organisms provide limited insights, as they do not fully replicate C. cayetanensis biology.
• Genomic studies show distinct lineages, but incomplete assemblies limit further analysis.
• Remediation strategies are underexplored, with potential resistance to conventional sanitizers.

Conclusions:

• Significant challenges persist in detecting and researching Cyclospora cayetanensis, impacting risk assessment and surveillance.
• Emerging technologies like metagenomics and AI-driven bioinformatics offer promise for overcoming current limitations.
• Further research and technological advancements are essential to improve detection, understand host-parasite interactions, and mitigate the public health impact of cyclosporiasis.